homework5

#include <iostream>

using namespace std;
int a[10];
struct node
{
    int data;
    node *next;
};
void createlist(node*& head, node*& tail, int item)
{
    node *newNode = new node;
    newNode->data = item;
    newNode->next = NULL;
    if(head == NULL)
        head = tail = newNode;
    else
    {
        tail->next = newNode;
        tail = tail->next;
    }
}
int even_number(node *&head)
{
    int i = 0;
    node *temp;
    temp = head;
    if(head == NULL)
    {
        cout<<"List is empty\n";
        return 0;
    }
    else
    {
        while(temp != NULL)
        {
            if(temp->data%2==0)
            {
                a[i] = temp->data;
                i++;
            }
            temp = temp->next;
        }
    }
    return i;
}
int main()
{
    node *head,*tail;
    tail = head = NULL;
    int choice,i,item,x;
    do
    {
        cout<<"1 - create list \n";
        cout<<"2 - show the even number\n";
        cout<<"3 - exit\n";
        cout<<"Enter your choice : ";
        cin>>choice;
        switch(choice)
        {
        case 1:
            for(i=0;i<10;i++)
            {
                cout<<"Enter the item : ";
                cin>>item;
                createlist(head,tail,item);
            }
            break;
        case 2:
            x = even_number(head);
            for(i=0;i<x;i++)
            {
                cout<<"even data is : "<<a[i]<<endl;
            }
            break;
        default:
            cout<<"\n\nBYE\n\n";
            break;
        }
    }while(choice != 3);
    return 0;
}